Question

two angles whose measure are a and b such that 2a-3!b=60°then 4a÷5b=?if they form a linear pair​

Answer 1

note the they forming linear pair so a+b = 180

then we have two equation are a+b=180and second one is 2a-3b=60°

so we will use here elimination method to get value of a and b

a+b=180

2a-3b=60

after this we will make one variable same in both equation by multiply any no.

then we will subtract equation 2 from 1

then we get value of one variable then we will put that in the equation to get value of another variable.

As I have solved the above subtraction and I get the value of a =90 and b=90.

then we will put this on asked question and we will get the answer .